When pressured Djokovic doesn't go for his shots he plays to keep the ball in play. He won that match with defense and stamina only ,the main problem he will have against Murray is that he can match him stroke for stroke and endurance.

There are few players, who have won consecutive 5 setters in SF and F. Djoko is a physical beast, but IMO Murray is a better player in their matchup (not overall). So if Murray is physically ok, he will win. But there is a chance Murray gets fatigued. It's a very grueling matchup.